Core was generated by `/usr/sbin/asterisk -f -U asterisk -G asterisk -vvvg -c'.
Program terminated with signal 11, Segmentation fault.
#0  0x00a8e39c in pthread_mutex_lock () from /lib/libpthread.so.0
(gdb) bt
#0  0x00a8e39c in pthread_mutex_lock () from /lib/libpthread.so.0
#1  0x08084186 in ast_waitfor_nandfds (c=0xb774d180, n=1, fds=0xb774d18c, nfds=0, exception=0x0, outfd=0xb774d168, ms=0xb774d184)
    at /home/src/asterisk/asterisk-1.4.21.2/include/asterisk/lock.h:755
#2  0x08086499 in ast_waitfordigit_full (c=0xb7217e40, ms=100, audiofd=-1, cmdfd=-1) at channel.c:1828
#3  0x08086868 in ast_waitfordigit (c=0xb7217e40, ms=100) at channel.c:1791
#4  0x009a1476 in common_exec (chan=0xb7217e40, flags=0xb7782e88, volfactor=0, fd=0, mygroup=0xb7781e44 "3647", spec=0x0, 
    exten=0x0, context=0x0) at app_chanspy.c:527
#5  0x009a2405 in chanspy_exec (chan=0xb7217e40, data=0xb7784f08) at app_chanspy.c:740
#6  0x080caa8b in pbx_extension_helper (c=0xb7217e40, con=0x0, context=0xb7217fc0 "dialout", exten=0xb7218010 "83647", priority=1, 
    label=0x0, callerid=0xb72085f8 "3399", action=E_SPAWN) at pbx.c:537
#7  0x080cd0d2 in __ast_pbx_run (c=0xb7217e40) at pbx.c:2317
#8  0x080ce08e in pbx_thread (data=0xb7217e40) at pbx.c:2636
#9  0x080fc03b in dummy_start (data=0xb7200f68) at utils.c:895
#10 0x00a8c46b in start_thread () from /lib/libpthread.so.0
#11 0x001e0dbe in clone () from /lib/libc.so.6